What is another word for rosetta stone?

Definitions and Synonyms of rosetta stone | Another word for rosetta stone | What is rosetta stone?

Definition 1: a part of an inscribed granite stela that was originally about six feet tall and was set up in 196 BC; the inscriptions in hieroglyphics and Demotic and Greek gave the first clues to the decipherment of Egyptian hieroglyphics - [noun denoting communication]